Abstract
Summary Rats trained to make a white-black discrimination in a two-choice chamber were subjected to the following treatments: Group C, normal controls; Group 1-St, simultaneous posterior neocortex removal; Group 2-St, successive damage to posterior neocortex with an interoperative interval of one week; Group 2-StT, successive damage to posterior neocortex with specific training during a seven-day interoperative period. All brain-damaged groups were significantly inferior to the normal controls when tested for retention. Additionally, no evidence for sparing of function was seen in the serially lesioned subjects. It was suggested that complete removal of the geniculostriate system may prevent functional reorganization even in successively lesioned, interoperatively trained animals.
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